Need some help with this one, apologies if it is already on a thread but could not find anything.

Have had a tenant leave a property, and he has now gone abroad. The flat is empty and he has given keys back and confirmed in writing that he has left the flat for good.

The contract is still running and currently owes a lot, I am trying to re let but is takign time and short notice.

I have the address for the tenants mother in Cyprus, How can I regain the rent owed from Cyprus, and can i send it to his mothers address as this is were he lives most of the time. He only came to UK to study.